Edge Computing with Cloudflare Workers & Deno · درس

مخزن Cloudflare KV

استخدم Cloudflare Workers KV لتخزين أزواج المفتاح والقيمة عند الحافة، وهو مثالي للتخزين المؤقت والإعدادات

مخزن Cloudflare KV درس مجاني في Edge Computing with Cloudflare Workers & Deno على CoddyKit. هذا هو الدرس 1 من أصل 4. يمكنك قراءة الدرس كاملاً أدناه مجاناً — ثم تمرن عليه مباشرة في المتصفح باستخدام محرر أكواد مدمج ومدرس ذكاء اصطناعي متاح 24/7. هذا الدرس جزء من مسار التعلم في Edge Computing with Cloudflare Workers & Deno، وتقدمك يتزامن عبر الويب وتطبيق CoddyKit. تتضمن دورة Edge Computing with Cloudflare Workers & Deno 4 دروس في المجموع.

بعض أجزاء هذا الدرس لم تُترجم بعد وتظهر باللغة الإنجليزية.

Edge Data with KV Store

Welcome to Cloudflare KV! It's a highly distributed key-value store that runs on Cloudflare's global network, right at the edge.

This means your data is stored incredibly close to your users, leading to extremely fast access and low latency. It's perfect for dynamic content, configuration, and caching.

How Key-Value Works

A key-value store is like a simple dictionary or map. You store data as unique key-value pairs. The key is a unique identifier (a string), and the value is the data associated with that key.

Keys: Think of them as unique names, like "user_id_123" or "website_config".
Values: These are the actual data, which can be strings, numbers, JSON objects (as strings), or even binary data.

KV's Edge Advantages

Why use KV at the edge?

Speed: Data is served from the nearest Cloudflare data center, reducing latency.
Simplicity: It's schemaless, making it easy to store and retrieve data without complex database schemas.
Scalability: Automatically scales to handle massive traffic and global distribution.
Cost-Effective: Often more economical for specific use cases compared to traditional databases.

Practical KV Applications

Cloudflare KV is versatile for many edge-specific tasks:

Caching: Storing frequently accessed API responses, HTML snippets, or static assets.
Configuration: Managing dynamic feature flags, A/B test settings, or redirect rules.
Personalization: Storing simple user preferences like theme choices or language settings.
Rate Limiting: Keeping track of request counts per user or IP address.

Creating a KV Namespace

Before using KV, you need to create a Namespace. A namespace is a logical container for your key-value pairs, keeping your data organized.

You can create a new KV Namespace through the Cloudflare dashboard or using the Wrangler CLI (Cloudflare's command-line tool).

Binding KV to Your Worker

To use a KV Namespace in your Worker, you must bind it in your wrangler.toml configuration file. This makes the KV namespace accessible as a global variable in your Worker script.

Here's how you define a binding:

name = "my-worker"
main = "src/index.js"
compatibility_date = "2024-01-01"

[[kv_namespaces]]
binding = "MY_KV_STORE" # The variable name in your Worker
id = "YOUR_NAMESPACE_ID" # Get this from Cloudflare dashboard

Storing Data with `put`

The put() method is used to store data in your KV Namespace. It takes a key and a value as arguments. Values can be strings, ArrayBuffers, or ReadableStreams.

Try running this example Worker:

export default {
  async fetch(request, env, ctx) {
    const key = "user_setting";
    const value = "dark_mode";
    
    // Store the value in the MY_KV_STORE namespace
    await env.MY_KV_STORE.put(key, value);
    
    return new Response(`Stored '${value}' for key '${key}'`);
  },
};

Retrieving Data with `get`

To retrieve a value, you use the get() method, providing the key. If the key doesn't exist, get() will return null.

This example tries to retrieve the setting we just stored:

export default {
  async fetch(request, env, ctx) {
    const key = "user_setting";
    
    // Retrieve the value from the MY_KV_STORE namespace
    const value = await env.MY_KV_STORE.get(key);
    
    if (value === null) {
      return new Response(`Key '${key}' not found.`, { status: 404 });
    }
    
    return new Response(`Retrieved: '${value}'`);
  },
};

Removing Data with `delete`

If you need to remove a key-value pair from your namespace, use the delete() method with the key you wish to remove.

Here's how to delete the stored setting:

export default {
  async fetch(request, env, ctx) {
    const key = "user_setting";
    
    // Delete the key-value pair from the MY_KV_STORE namespace
    await env.MY_KV_STORE.delete(key);
    
    return new Response(`Key '${key}' deleted.`);
  },
};

Listing Keys in KV

Cloudflare KV also provides a list() method to retrieve a list of keys within a namespace. This can be useful for administrative tasks or for understanding the contents of your KV store.

It often returns an object containing an array of keys and a list_complete boolean.

// Example of listing keys (inside a Worker's fetch handler)
const { keys } = await env.MY_KV_STORE.list();

// To get just the names:
const keyNames = keys.map(k => k.name);
console.log(keyNames);

KV Operations Check

Which of the following statements about Cloudflare KV are true?

Recap: Cloudflare KV Store

In this lesson, you've learned about Cloudflare KV, a powerful key-value store optimized for the edge. We covered:

What KV is and its advantages for low-latency data access.
Common use cases like caching and configuration.
How to create a KV Namespace and bind it to a Cloudflare Worker.
The core operations: put() to store, get() to retrieve, and delete() to remove data.

KV is a fundamental tool for building fast, scalable, and efficient edge applications!

الأسئلة الشائعة

هل درس «مخزن Cloudflare KV» مجاني؟

نعم — نص درس «مخزن Cloudflare KV» كامل متاح مجاناً هنا على الويب. لتمرينه بشكل تفاعلي (محرر أكواد مدمج ومدرس ذكاء اصطناعي متاح 24/7) وفتح باقي دورة Edge Computing with Cloudflare Workers & Deno، انتقل إلى CoddyKit PRO. تتضمن دورة Edge Computing with Cloudflare Workers & Deno 4 دروس في المجموع.

ماذا ستتعلم في «مخزن Cloudflare KV»؟

استخدم Cloudflare Workers KV لتخزين أزواج المفتاح والقيمة عند الحافة، وهو مثالي للتخزين المؤقت والإعدادات تتمرن على Edge Computing with Cloudflare Workers & Deno مع أكواد عملية تشغلها مباشرة في المتصفح، ومدرس ذكاء اصطناعي متاح 24/7 يجيب على أسئلتك أثناء عملك.

هل أحتاج إلى خبرة سابقة لأبدأ Edge Computing with Cloudflare Workers & Deno؟

لا تُشترط خبرة سابقة. Edge Computing with Cloudflare Workers & Deno على CoddyKit منظم للمبتدئين حتى المتقدمين، لذا يمكنك البدء من هنا أو من البداية والتقدم بسرعتك الخاصة. هذا هو الدرس 1 من أصل 4.

كم من الوقت يستغرق درس «مخزن Cloudflare KV»؟

معظم دروس CoddyKit تستغرق حوالي 5–10 دقائق. كل منها موجز وتفاعلي، لذا تحرز تقدماً مستمراً وتستأنف من حيث توقفت عبر الويب والتطبيق.

هل يمكنني كتابة وتشغيل أكواد في درس Edge Computing with Cloudflare Workers & Deno هذا؟

نعم. كل درس في Edge Computing with Cloudflare Workers & Deno يتضمن محرر أكواد مدمج، لذا تكتب وتشغل أكواداً حقيقية مباشرة في متصفحك وتحصل على تعليقات فورية من الذكاء الاصطناعي — بدون إعداد محلي.

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